As NASA's Mars Exploration Rover Opportunity continues to traverse from "Erebus
Crater" toward "Victoria Crater," the rover navigates along exposures of
bedrock between large, wind-blown ripples. Along the way, scientists have been
studying fields of cobbles that sometimes appear on trough floors between
ripples. They have also been studying the banding patterns seen in large
This view, obtained by Opportunity's panoramic camera on the rover's 802nd
Martian day (sol) of exploration (April 27, 2006), is a mosaic spanning about
30 degrees. It shows a field of cobbles nestled among wind-driven ripples that
are about 20 centimeters (8 inches) high.
The origin of cobble fields like this one is unknown. The cobbles may be a
lag of coarser material left behind from one or more soil deposits whose finer
particles have blown away. The cobbles may be eroded fragments of meteoritic
material, secondary ejecta of Mars rock thrown here from craters elsewhere on
the surface, weathering remnants of locally-derived bedrock, or a mixture of
these. Scientists will use the panoramic camera's multiple filters to study
the rock types, variability and origins of the cobbles.
This is a false-color rendering that combines separate images taken through
the panoramic camera's 753-nanometer, 535-nanometer and 432-nanometer filters.
The false color is used to enhance differences between types of materials in
the rocks and soil.
La Caption è la
stessa del fotogramma
Questa immagine è
in falsi colori ed è basata sull'unione di fotogrammi grezzi con
filtri a 753, 535 e 432 nanometri. Il falso colore viene impiegato
per enfatizzare le differenze fra i tipi di materiali tra le rocce
ed il terreno.